What metric unit would you use to measure: the amount of water in a pool? the mass of an elephant? the length of a paperclip? pls

To measure water in a pool? gallons
elephant? pounds or kilograms depending where you live
paperclip? centimeters
hope this

The product will have 102 zeroes since if you multiply any number like 1000,10, 10000, etc. then you just add zeroes to the end. If you multiplied a googol and 10 together, you add two more zeroes to the end of the number googol, making it have 102 zeroes.